| A | B |
|---|
| Adaptation | A characteristic of an organism to increase its chance of survival. |
| Asteroid | Any of numerous small, irregular shaped rocky bodies that orbit the Sun primarily in the asteroid belt, a region between the orbits of Mars and Jupiter. |
| Atom | The smallest unit of a chemical element. |
| Barometric pressure | The pressure of the atmosphere. |
| Chemical change | A reaction or a change in a substance producing a different chemical. |
| Conductor | A material or an object that conducts heat, electricity, light, or sound. |
| Dissolve | To cause to pass into solution. |
| Gravity | The force of attraction between any two objects. |
| Experiment | A procedure to test a hypothesis. |
